American experimental high altitude fighter design from 1942. To speed up development the design utilised various of-the-shelf airframe components together with a new 24-cylinder engine mounted behind the pilot driving contra-rotating propellors. The combination of mis-mathched aerodynamics and unproven engine was not a happy one and performance was disappointing.
By the time the XP-75 was flyable the US needed a long-range escort more than a high altitude interceptor and the entire design was revised as the XP-75A which appeared very similar but included many detail changes. The success of the Mustang removed the need for the Eagle and the project was cancelled in late 1944.